<template>
  <div :class="['star', starType]">
    <span 
      v-for="(itemClass, index) in itemClasses" 
      :key="index" 
      :class="['star-item', itemClass]"
    >

    </span>
  </div>
</template>

<script>
const LENGTH = 5
const CLS_ON = "on"
const CLS_OFF = "off"
const CLS_HALF = "half"

export default {
  name: "Star",
  props: {
    score: {
      type: Number,
      defaault: 0
    },
    size: {
      type: Number,
      defaault: 36
    }
  },
  computed: {
    starType() {
      return "star-" + this.size
    },
    itemClasses() {
      let result = []
      let score = Math.floor(this.score * 2) / 2 
      let hasDecimal = score % 1 !== 0
      let integer = Math.floor(score)
      for(let i = 0; i < integer; i++) {
        result.push(CLS_ON)
      }
      if(hasDecimal) {
        result.push(CLS_HALF)
      }
      while(result.length < LENGTH) {
        result.push(CLS_OFF)
      }
      return result
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import '~@/assets/stylus/mixin.styl'
  .star
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &:last-child
          margin-right 0
        &.on
          bg-image("star48_on")
        &.half
          bg-image("star48_half")
        &.off
          bg-image("star48_off")
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 3px
        background-size 15px 15px
        &:last-child
          margin-right 0
        &.on
          bg-image("star36_on")
        &.half
          bg-image("star36_half")
        &.off
          bg-image("star36_off")
    &.star-24
      .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &:last-child
          margin-right 0
        &.on
          bg-image("star24_on")
        &.half
          bg-image("star24_half")
        &.off
          bg-image("star24_off")
</style>
